Limits of data rates in the urban mobile channel

The bit error rate performance of data transmission schemes is evaluated when operating over the Rayleigh fading urban radio mobile channel. Two typical situations are analysed : the fast fading with differential detection and the frequency-selective fading with coherent detection, for BPSK, QPSK and MSK modulations. Conditions for which the fast fading or the frequency-selective fading effects may be neglected are given in terms of the data rate. The influence of the shape of different spatial and frequency correlation functions on the bit error rates is also analysed.